Halo: Reach Walkthrough & Strategy Guide

Go to the weapons area to the right of the lab entrance you're here to protect. There are jet packs along the wall, though they're not highlighted by glowing icons. Equip a jet pack and turn around, running for the nearest turret that you're supposed to enable. Jump over the turret and fly onto the rock formation behind it. Follow the rock formation to the ledge and use the jet pack to fly across the chasm, landing on a small ledge around the corner of the building, under a bridge.